In UE5.5(final), when adding plugin from an older version of Unreal to a BP project, we are informed that the Engine Modules are out of date, and cannot be compiled while the engine is running. Please build through your IDE.

UE - Foundation - Cpp Tools - Nov 19, 2024

In UE5.5(final), when adding plugin from an older version of Unreal to a BP project, we are informed that the "Engine Modules are out of date, and cannot be compiled while the engine is running. Ple ...

Sphere Reflection Captures overridden by Skylight

UE - Graphics Features - Jun 10, 2025

When using non-Lumen lighting and Screenspace reflections off, the skylight location overrides the Reflection Capture location during Build Reflections. This results in a Reflection Capture taken fr ...

Toggling ULevelStreaming::bShouldBeVisible causes replication errors

UE - Networking - Mar 17, 2017

Looks like the replication system doesn't properly account for bShouldBeVisible. Once a level has be marked bShouldBeVisible=false on the server, the level is completely cleaned up and all actor cha ...

Relationship between joycon stick value and Deadzone

UE - Gameplay - Input - Mar 22, 2018

Setting the dead zone of Joicon causes the dead zone to be ignored in the direction of full X, -X, or Y, -Y. ...

Component Array doesn't update properly when using Text Variables

Tools - Sep 19, 2018

A Component Array doesn't update properly when using Structure Variables. Any array elements added after the setup don't get printed when the event is called. If you set the "Editable when Inherited ...

GenerateProxyMesh causes incorrect transform in ISM using Scale

UE - World Creation - Worldbuilding Tools - HLOD - Aug 20, 2019

MeshVertex has been converted by component transform before being converted by instance transform. It is ( Vertex * ComponentTransform ) * InstanceTransform. I thought it has to be converted by (Ve ...

Can't connect nor send packet via TCP socket in iOS

UE - Platform - Apple - Jun 9, 2020

TCP Socket messaging in iOS seems not working.  ...

Widgets stick out from letterboxed player screen on 4.25

UE - Editor - UI Systems - Sep 28, 2020

Note:   Clipping on letterboxed player screen works fine on 4.24.   This issue was brought in by CL#10541213. Here's a workaround TSharedPtr<SGameLayerManager::FPlayerLayer> SGameLayerManager::Fin ...

Scrubbing material roughness value in MI causes large frame drops

UE - Rendering Architecture - Materials - Apr 30, 2022

It is possible for PreLoadScreen to leak memory when an EngineLoadingScreen returns IsDone while still loading

UE - Graphics Features - Jan 9, 2025

It is possible for a class that implements IPreLoadScreen to leak memory if GetPreLoadScreenType returns EngineLoadingScreen and IsDone returns true before the engine signals loading is completed vi ...